Add page for Bridge Alarms audio

[Maldor]

1. What section should this page be filed under?
   Under Audio section, see Add wiki page for Audio based modifications #2
2. What feature/function does this document?
   /content/audio/Bridge_alarm_4.ogg
3. How will this assist future modders?
   This is the file that is used when damaged is sustained and the alarm must be sound OR when the alarm is manually started

• Where is the file located?
  /content/audio/Bridge_alarm_4.ogg
• What is contained in the file?
  Sound used for Bridge alarm
• Are there any known game functions that reference data in this file?
  Unknown, possibly vars
  alarm_off alarm_on alarm_status
• Are there any files that this file references?
  None